Mi4c Sim No Signal

Discussion in 'Xiaomi Mi 4' started by Despotas, Jan 20, 2016.

  1. Despotas

    DespotasMembers

    Jan 20, 2016
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    Hello all. Just got a new Mi4C 32GB and installed the SIM but I cannot get any mobile signal.
    The phone had EU developer version 5.11.19 and I have also tried 5.12.31 and the Greek 6.1.7 but no luck.
    I have also tried 2 SIMs but the result is the same. The SIM is partially recognized in the settings (data etc.) but the antenna does not seem to work.

    The same SIM works fine on my old phone.
     

    Attached Files:

  2. 246ndh

    246ndhMembers

    Jan 10, 2016
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    Boot to recovery or reset factory setting for new actice.

    Gửi từ Mi-4c của tôi bằng cách sử dụng Tapatalk
     
  3. Despotas

    DespotasMembers

    Jan 20, 2016
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    I have already done factory reset 3 times when changing to the new Rom. The problem remains. What is actice?
    Could the phone be locked or defective?
     
  4. 246ndh

    246ndhMembers

    Jan 10, 2016
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    Wipe reset factory from TWRP. (To new active, no actice)

    Gửi từ Mi-4c của tôi bằng cách sử dụng Tapatalk
     
  5. Despotas

    DespotasMembers

    Jan 20, 2016
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    Already done that, each time I changed to a new ROM.
     
  6. 246ndh

    246ndhMembers

    Jan 10, 2016
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    Reset Factory from twrp is need, for New Setting, when u update rom or change betwwen rom stable and dev

    Gửi từ Mi-4c của tôi bằng cách sử dụng Tapatalk
     
  7. Despotas

    DespotasMembers

    Jan 20, 2016
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    I already did this. Each time before changing ROMS, I go to TWRP and factory reset. Then I install the new ROM.
     
  8. 246ndh

    246ndhMembers

    Jan 10, 2016
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    And for new settings? wipe data with no internal storage. This action is need to reactive sim.

    Gửi từ Mi-4c của tôi bằng cách sử dụng Tapatalk
     
  9. Despotas

    DespotasMembers

    Jan 20, 2016
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    So I go to Wipe, Advanced Wipe and select everything except internal storage?
     
  10. 246ndh

    246ndhMembers

    Jan 10, 2016
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    Yes. That is First for change rom between stable rom and dev rom. Tips, u should reupdate when exe this wipe. Remember, reupdate again when u do this step.

    Gửi từ Mi-4c của tôi bằng cách sử dụng Tapatalk
     
  11. Despotas

    DespotasMembers

    Jan 20, 2016
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    Well, nothing. The problem remains..
     
  12. 246ndh

    246ndhMembers

    Jan 10, 2016
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    Maybe your phone had actived for a other sim, with function find this phone on. When reset factory, phone need this sim to reactive.

    Gửi từ Mi-4c của tôi bằng cách sử dụng Tapatalk
     
  13. Despotas

    DespotasMembers

    Jan 20, 2016
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    Is there any way to check if the phone is locked, for example to just Chinese SIMs?
     
  14. Brian Nguyen

    Jan 23, 2015
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    What kind of network are you using?
    By the way, you can test the hardware with Settings > About > touch 4 times on Kernel Version.

    I also search around similar problem on Chinese forum, some got the same situation, and still no solution yet.
     
  15. Despotas

    DespotasMembers

    Jan 20, 2016
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    The network is Vodafone Greece. The same SIM works fine on my old phone.

    I did the test and it says SIM OK but of course no mobile signal.

    It's frustrating because no way to tell if it is faulty hardware or software bug. Anyway, I decided to RMA the phone..
     
  16. 246ndh

    246ndhMembers

    Jan 10, 2016
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    [​IMG]

    Sent from my Mi-4c using Tapatalk
     
  17. Bunyku

    BunykuMembers

    Mar 7, 2017
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    did you solve the issue?
     

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